Thruxton Stem Nut Thread On Thruxtton R 2017

Does anyone know what thread the stem nut is on the thruxton r? I want something like this to mount my sat nav.
The ones I’ve seen listed on eBay, only list the thruxton and not the thruxton r, and none of them know what thread the r is.
Spoke to dealer and he reckoned it’s M25 but doesn't know the pitch.
The bonneville and thruxton are listed as M22x1.5 pitch

 

Hi Andy,
Thanks for that. Just need to see if they do the correct size for it now then
I thought the pitch would’ve been at least 1.5mm, the same as the M22x1.5mm on the bonneville and thruxton

 

Looks like a lot of Kawasaki are that size also